Coax Tutorial Includes:
Coax feeder Coax specifications overview Coax impedance Coax loss / attenuation Coax power rating Coax velocity factor Coax environmental Coax installation tips Coax cable types Tips for choosing right coax cable Buying TV coax: points to note
There are many different varieties of coax cable that can be bought. Different types obviously have different performance specifications.
The choice of a particular type of coax cable depends on a number of factors – each choice being dependent upon the particular requirements for where it is to be used.
RG and UR coax cable references
Over the years systems developed whereby standard number systems. This enabled coax made by different manufacturers to conform to the same standard.
Over the years two basic systems evolved for defining RF cables. One originated in the United Kingdom and its type numbers all start with UR. The other system is American with type numbers commencing with the letters RG.
- UK UR system for coax cable types: The UR system as defined in the UK and is still widely used for coaxial cable. UR standard for Uniradio, and later the URM series stands for Uniradio Metric.
- USA RG systems for coax cable types: The RG series was originally used to specify the types of coax cables for military use, and the specification took the form RG (RG from Radio Guide) plus two numbers. In some instances these numbers were followed by the letter U which indicated it was for multiple uses. These types of coax cable were all listed in the MIL-HDBK-216 which is now obsolete. Although full MIL specifications are now officially used for specifying most components for military use, the RG series of RF cables continued to be used because of its widespread acceptance. However it should be noted that the RG specifications are no longer maintained so there is no complete guarantee to the exact specification for the particular type of coax cable
Coax cable data summary
Data of some of the more commonly used types of coax or coaxial cable: most of these RF cables are easily available from RF coax cable stockists.:
|Coax Cable Data|
@ 100 MHz
@ 1000 MHz
|RG213/U||50||10.3||0.66||0.62||2.6||Braid shield, polythene dielectric|
|RG214/U||50||10.8||0.66||0.76||2.9||Double screened braid, silver plated copper wire|
|RG223/U||50||5.5||0.66||1.58||5.4||Double screened braid shield|
|UR43 / URM43||50||5||0.66||1.3||4.46||Plain copper wire braid|
|UR57 / URM57||75||10.3||0.66||0.63||2.3||Similar to RG11A/U – plain copper wire braid.|
|UR67 / URM67||50||10.3||0.66||0.66||2.52||Similar to RG213/U – plain copper wire braid|
|UR74 / URM74||50||22.1||0.66||0.33||1.4||Plain copper wire braid|
|UR76 / URM76||51||5||0.66||1.7||7.3||Similar to RG58C/U, plain copper wire braid|
|UR90||75||6.1||0.66||1.2||4.1||Similar to RG59B/U|
|URM91||50||11.0||0.66||Double plain copper wire braid|
Data for attenuation figures are typical figures and measured in dB / 10 metres.
Dimensions in mm.
This RF cable data has been presented as a guide and no liability can be taken for any errors or mistakes in the data. Naturally every care has been taken to ensure the data concerning these RF cables is correct.
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